The answer to 'why is my P-trap slow draining' is that the P-trap, the curved pipe under your sink, may be clogged with debris or buildup. This can cause water to drain slowly or back up in the sink. Common causes include hair, soap scum, food particles, and other organic matter that accumulates over time.
Some signs of a slow-draining P-trap include water taking longer than usual to drain, a gurgling sound, or the sink not fully emptying. To fix a slow-draining P-trap, you may be able to try DIY methods like using a plunger or drain snake to clear the clog. However, if the clog is severe or the problem persists, it's best to call a professional plumber to inspect and properly clear the P-trap.